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Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki

Theory of stimulated coherent emission from atoms in spaced light fields

E. V. Baklanov, B Ya Dubetskiĭ, Семибаламут Владимир Михайлович

Published Feb 1, 1979• 0 citations
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Theory of stimulated coherent emission from atoms in spatially separate optical fields

E. V. Baklanov, B Ya Dubetskiĭ, Семибаламут Владимир Михайлович

Journal of Experimental and Theoretical Physics•Feb 1, 1979•1 citation

The Role of Interference Effects in the Amplification of Light by Stimulated Emission

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The mechanisms behind the amplification of light by stimulated emission are investigated using a semiclassical approach. The theory is developed in the plane wave mode picture so as to follow closely the correspondence with the usual quantized field treatment. It is shown that the interference between stimulating and stimulated fields is an essential process for producing the well-known first-order effects, and that interference between stimulated emission fields from different atoms in the sample determines the spatial distribution of the amplification when this is measured locally using a light detector without mode discrimination.

Optica Acta International Journal of Optics•May 1, 1981•0 citations

Elementary processes of lengthening of spontaneous radiation trains

Vladimir P Bykov, G V Shepelev

Spontaneous and stimulated emission from atoms in a free one-dimensional space is considered from the quantum-mechanical point of view. The resolvent method is used to calculate the field density matrix, average electric field, and electromagnetic field energy density for a spontaneously emitting atom. For an atom emitting in the field of another atom, calculations are made of the electric field of the spontaneous and stimulated radiation. It is shown how the coherence length and coherence time of the spontaneous radiation increase. The application of these results in laser theory to explain the formation of a radiation mode structure and consequent appearance of coherent radiation is discussed.

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Exact calculation of stimulated emission driven by pulsed light

Kevin A. Fischer

Stimulated emission can be defined as the process when an incoming photon stimulates an additional quantum of energy from an atom into the same electromagnetic mode as the impinging photon. Hence, the two outgoing photons are identical. In a waveguide or free space, this intuition is typically found through Fermi's Golden rule, however, this does not properly account for the wave-like nature of the photons. Here, I present an exact solution to stimulated emission from a quantum two-level atom that properly accounts for the incoming and outgoing electromagnetic modes. This result is valid over a huge range of incident photon numbers. For a single incident photon, it shows how the photon must properly mode match the two-level system to cause stimulated emission. For a Fock state drive with large photon number, the exact solution shows how a two-level system Rabi oscillates with the traveling Fock mode as it passes by. I additionally use the same formalism to show that stimulated emission by a coherent pulse cannot be understood as an additional photon being emitted into the incident coherent state because the two-level system's state factorizes with the electromagnetic field's coherent state. Recent advances in superconducting circuits make them an ideal platform to test these predictions.

arXiv:1806.04862•OSA Continuum•Oct 12, 2018•11 citations
The mechanisms behind the amplification of light by stimulated emission are investigated using a semiclassical approach. The theory is developed in the plane wave mode picture so as to follow closely the correspondence with the usual quantized field treatment. It is shown that the interference between stimulating and stimulated fields is an essential process for producing the well-known first-order effects, and that interference between stimulated emission fields from different atoms in the sample determines the spatial distribution of the amplification when this is measured locally using a light detector without mode discrimination.
Spontaneous and stimulated emission from atoms in a free one-dimensional space is considered from the quantum-mechanical point of view. The resolvent method is used to calculate the field density matrix, average electric field, and electromagnetic field energy density for a spontaneously emitting atom. For an atom emitting in the field of another atom, calculations are made of the electric field of the spontaneous and stimulated radiation. It is shown how the coherence length and coherence time of the spontaneous radiation increase. The application of these results in laser theory to explain the formation of a radiation mode structure and consequent appearance of coherent radiation is discussed.
Stimulated emission can be defined as the process when an incoming photon stimulates an additional quantum of energy from an atom into the same electromagnetic mode as the impinging photon. Hence, the two outgoing photons are identical. In a waveguide or free space, this intuition is typically found through Fermi's Golden rule, however, this does not properly account for the wave-like nature of the photons. Here, I present an exact solution to stimulated emission from a quantum two-level atom that properly accounts for the incoming and outgoing electromagnetic modes. This result is valid over a huge range of incident photon numbers. For a single incident photon, it shows how the photon must properly mode match the two-level system to cause stimulated emission. For a Fock state drive with large photon number, the exact solution shows how a two-level system Rabi oscillates with the traveling Fock mode as it passes by. I additionally use the same formalism to show that stimulated emission by a coherent pulse cannot be understood as an additional photon being emitted into the incident coherent state because the two-level system's state factorizes with the electromagnetic field's coherent state. Recent advances in superconducting circuits make them an ideal platform to test these predictions.